import React, { Component,lazy,Suspense } from 'react'
import {NavLink,Route} from 'react-router-dom'
import Loading from "./Loading";
// import Home from "./Home";
// import About from "./About";

// 使用懒加载的方式引入组件
const Home = lazy(()=>import('./Home') )
const About = lazy(()=>import('./About') )


export default class Demo extends Component {
    render() {
        return (
            <div>
                <div className="row">
                    <div className="col-xs-offset-2 col-xs-8">
                        <div className="page-header"><h2>React Router Demo</h2></div>
                    </div>
                </div>
                <div className="row">
                    <div className="col-xs-2 col-xs-offset-2">
                        <div className="list-group">

                            {/* 原生html中，靠<a>跳转不同的页面 */}
                            {/* <a className="list-group-item" href="./about.html">About</a>
							<a className="list-group-item active" href="./home.html">Home</a> */}

                            {/* 在React中靠路由链接实现切换组件--编写路由链接 */}
                            <NavLink className="list-group-item" to="/about">About</NavLink>
                            <NavLink className="list-group-item" to="/home">Home</NavLink>
                        </div>
                    </div>
                    <div className="col-xs-6">
                        <div className="panel">
                            <div className="panel-body">
                                <Suspense fallback={<Loading/>}>
                                    <Route path="/about" component={About}/>
                                    <Route path="/home" component={Home}/>
                                </Suspense>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        )
    }
}
